S.Watanabe, Y.Ohshiro, S.Yamaka, S.Kubono (CNS, Univ. of Tokyo) T.Nakagawa, T.Watanabe, T.Koseki, Y.Chiba, A.Goto, S.Kohara, M.Kase (RIKEN) M.Fukuda (JAERI-Takasaki), T.Hattori (TIT), M.Nishiura (NIFS) K.Noda, S.Hojo (NIRS), M.Watanabe (JAERI-Tokai), M.Oyaizu, H.Miyatake (KEK) Dec/07/2005 CNS-PAC Upgrade of K70 AVF Cyclotron and Accelerator Development at CNS Dec/07/2005

１０ GH ｚ ECR Upgrading of K70 AVF Cyclotron HyperECR:Increasing beam intensity & Development of New element acceleration Dec/07/2005 CNS-PAC Researches using low energy RI beam will be extended by increasing primary beam intensities, expanding the acceleration energy range and improving the beam quality. K70 AVF: Expanding Acceleration energy and improving beam quality Background

Upgrading of K70 AVF Cyclotron － Expanding Acceleration Energy ー Plans & Result ●Change of Deflector （ ’03 ) ●Upgrade Main Coil PS （ ’04) ・Ｉ ＭＣ ＝１１４４．３１Ａ → Power rating up to ＋４％ ・ Max Current １１００Ａ → １２００Ａ ●Upgrade Trim Coils （ ’05) ・ Make isochrones field at K78 by Ｃ５、 Ｃ６ ・Ｃ５ PS: Up to ２００Ａ ( １３２Ａ required) ・Ｃ 6PS: Up to ２ 5 ０Ａ (172 Ａ require) ●RF Acceleration system （ in progress) ・ Nominal Ｄｅｅ Vol.= ５０ｋＶ＠１６ ＭＨｚ ・ > ５６ｋＶ : Pre. Amp. （８００Ｗ） is required ・５０ｋＶ at Dee is OK for F1 ・ Improvement of FT system is required for Δ Ｅ / Ｅ＝ 0.01 ％ (goal) ●Modify the central region ｈ＝ 1,2,3 （ ’06) ●Modify the Magnetic channel （ ’07) ex ； 9MeV/u 15 N 5+ 10p  A(expected) B ： (T), Rf ： (MHz) 、ｈ＝ 2 （ｈ： harmonic number ＝ number of bunched beam ） Acceleration Energy Ｋ７０ → Ｋ ７８ 原研高崎：福田光宏、理研：後藤、小原、長瀬、加瀬氏との共同研究 Dec/07/2005 CNS-PAC Beam from ECR Acc. gap Magnet Inflector Dee Deflector Grazer lenses Beam focusing lenses

Upgrading of K70 AVF Cyclotron Central region ● Central region ｈ＝１，２，３（ ’06) ・ Inflector electrode for each harmonic → ｈ＝１、２、３ ・ Dee tips → Wider acceptance for the mode of all harmonics ・ New RF shield for the mode of all harmonics ●Inflector electrodes changer ・ Automatic insertion and quick exchange RF shield Dee tips Inflector electrode 40 MeV Proton B ： 1.29 (T), RF ： 18.9 (MHz) 、ｈ＝ １ （ｈ： harmonic number) Expansion of acceleration energy h=3 allows q/A=5/1 Upgrade Main Coil PS (’04) Dec/07/2005 CNS-PAC Old Trans New Trans installation -continued-

Upgrading of K70 AVF Cyclotron － Improvement of RF System ー Dec/07/2005 CNS-PAC Discharge occurs mainly at the lower ceramics insulator. Discharge occurs at variable coupling condenser (VCC) Vf1 Vf3 Vf1 +Vf3 1 2

Upgrading of K70 AVF Cyclotron － Improvement of RF System (continued) － Teflon covers suppress emission of electron from the high potential Attained ５０ｋＶ＠１６．３Ｍ Ｈｚ /FT Result Dec/07/2005 CNS-PAC Corona ring of VCC Leaks emission of electron 1 2

Ion Species Accel. Energy [Me/u] Ion source current [e  A]  [%] Extracted beam current [e  A] H+H C C N N Ne Li * 7 Li ** 40 Ar beam Hyper ECR － Increasing beam intensity and number of elements － 7 Li 3+ 7 Li 2+ Mass separation of 14 N 5+ and 7 Li 3+ 1 st,Tune AVF to 14 N 5+ 2 nd,Tune AVF to 7 Li 3+ by  B adjust Dec/07/2005 CNS-PAC  : Transmission efficiency *LiF rod / Nishimura Gr, March ‘05 **Li filled crucible / Yamaguchi Gr, Sept ’05

↑ LiF rod (  8X105L) Crucible→ ・ volume ： 5 (cc) ・ Li weight ： 1.7 (g) ↑ Photo of plasma chamber ① ７ Li 2+ → LiF rod （ LiF ： m.p=1143K ） ② ７ Li ３＋ →Crucible （ Fill piecemeal of ７ Li ） RF power conditions ７ Li ２＋ ：１５０ W ７ Li ３＋ ：３００ W ※３００ W→LiF melt down →use of crucible ７ Li 2+, ７ Li ３ ＋ Dec/07/2005 CNS-PAC Ｌｉ source ① ② Hyper ECR -continued-

Low energy bunched ion beam facility at CNS Faraday cup Cluster-ISRF-Buncher HiECR-IS Accelerator Development needle monitor Volume Ion Source VIS) Dec/07/2005 CNS-PAC Charge Breeding type ECR (CBECR)

q=1+ Ion source ＨｉＥ ＣＲ Injection system Cross-section of CBECR － Charge Breeding type ECR ion source (CBECR) － Accelerator Development S imulation of q=1+ Ion beam, Ein=10KV Deceleration voltage. ① 0V, ② 10kV, ③ 9.995kV ① ② ③ S imulation of injection beam Design the beam injection system Purchase the mechanical parts Advanced Upgrade of HiECR is in progress q=1+ Ion (Ar 1+ ) q=n+ Ion (Ar 11+ ) q=1+ Ion source; Gas or Metal ion Dec/07/2005 CNS-PAC Ein=10KV Eext=10KV Edec=9.995kV q=n+ Ion q=1+IS Einzel

Accelerator Development -Volume type ion source (VIS)- Type ： Kaufman type ion source Volume ：１０５ｍｍ D 、１１０ｍ ｍ L Weight ：１ｋｇ Plasma confinement ： Cusp field （ Ned １Ｔ、 6 poles ） Ion ： Ar 1+, H +, H - (achieved) V ext. ： ６ＫＶ max I beam ： １．５ｍＡ CBECR aims at effective extraction of high charge Ar ions from the injected Ar 1+. We have developed a volume type ion source for production of Ar 1+. 核融合研 西浦正樹氏との共同研究 Dec/07/2005 CNS-PAC Test bench Spec

Accelerator Development -Broad band RF cavity as a Beam buncher- We have designed and constructed a broad-band RF cavity as a buncher of heavy ion beams from an ion source. The cores employed are Finemet cut cores for low-Q cavity. The operating frequencies are between 18 and 40 MHz. The performance of the cavity has been tested at the beam line of the CNS-HiECR ion source. Ar 8+ beam/18MHz O 5+ beam/30MHz H + beam/45MHz 理研：小関、原研東海：渡辺、放医研：野田、北條氏との共同研 究 Dec/07/2005 CNS-PAC RF cavity

Reflectron type mass analyzer (MA) （ m /Δ m ~ 2000 ） is required Accelerator Development ‐ Cluster Ion Source/ High resolution TOF ‐ Design of Reflectron was completed with the aid of simulation code SIMION Tuning of MA is in progress 理研： 中川孝秀氏との共同研究 Dec/07/2005 CNS-PAC

Accelerator Development ‐ Cluster Ion Source/ Sputtering type ionizer ‐ Ionizer: Magnetron type sputter Metal target: Li~Cu Target support: Movable holder Plasma exciter: RF discharge Support gas: He or Ar Gas pressure: １ mTor ｒ～ 100mTorr Plasma confinement: Magnetic field+Rf electric field(13.56MHz) Plasma potential: ６００ eV Sputtering efficiency ０．１～２．３ Ion production rate: １０ １２ ／ｃｍ ３ The cluster ion source includes long-life ionizer with large intensity as a internal primary ion source. Sputtering type ionizer is under trial production. 理研： 中川孝秀氏との共同研究 Dec/07/2005 CNS-PAC

目標感度 １ナノアンペ ア Ion Beam Modification (IBM) of Current Sensor for the HTS-SQUID Monitor Ar 2+ bombardment: 20e  A/cm Accelerator Development ‐ High Temperature Super conducting (HTS)-SQUID Monitor ‐ Target=Bi2223 Beam Test at RRC 理研：渡辺環氏との共同研究 Dec/07/2005 CNS-PAC Current Sensor (Bi2223 / MgO) HTS-SQUID After IBM with100  m beam slit Study of HTS twin coils has been done with IBM. 100  m

Main Coil & Trim PS’s of AVF were upgraded for expansion of beam energy from K=70 to K=78. AVF RF System with FT attained 50kV at 16.3MHz. ７ Li 2+ was firstly extracted from HyperECR with LiF rod. ７ Li 3 ＋ was extracted from HyperECR with Li-filled crucible. Low energy bunched ion beam facility at CNS was constructed. Conversion of HiECR into CBECR is in progress. Ar 1+, H +, and H - were extracted from Volume type Ion Source. Sputtering type Ionizer for Cluster Ion Source is under trial production. Ion Beam Modification of Bi2223 has been done. Dec/07/2005 CNS-PAC Summary